26) what is the difference between "magma" and "lava"? 26) a. it is just a name change, lava is what magma is called if it reaches the surface of the earth. b. magma is formed deep in the earth and lava forms near the surface of the earth. c. magma makes igneous rocks and lava forms volcanoes. d. magma is less dense than lava.

Ageologist is working in an area with exposed sedimentary rocks and finds a well exposed sequence of stratified rocks. as he works through a thick sequence of limestone, he sees abundant large clam fossils that produce an interlocking texture suggesting a reef, but within the limestone section these clams disappear and the overlying limestone is made up primarily of fragments of corals. he now moves 50 km away and finds limestones interbedded with shales, and the limestones contain the same clam fossils he had seen previously 50 km away. as he continues through this section, the rocks become entirely limestone, and the clams disappear again with coral fossils above forming a reef structure. he concludes